Behance Help Center
At Behance, we host the platform for creative professionals to upload their work and portfolios, but we don't own the rights to any of the work.
However, users can mark their work as "for sale", so you'll notice that certain items that have the word "BUY" on the lower right hand corner. If you click this, you'll be directed to this user's online store, where you can purchase the work you're intersted in. To browse all the work that is "for sale," go to the Galleries --> Work For Sale.
If you're interested in buying or learning more about a work that isn't marked as "for sale," visit the Behance Profile of the person who created the project, clicking the "send message" button to the left of his or her profile photo is order to email them your question.